May be it can be useful 
It's FW with pretty informative design
GitHub - ProstoChel/BetterJoy: Better firmware for Joyetech devices: Wismec, Eleaf
Some features:
Regulated AutoFire
VaryVolt
Battery overtemp on charge protection - charge stops if board temp more than 50C (by default) //temporary disabled
Only 4 level for brightness
Everything can be tuned on the mod, no PC needed.
Games (flappy,tetris)
Realtime battery percentage - it shows battery drops
.X ohm format for less than 1 ohm resistance
realtime resistance and base(profile) resistance shows on main screen
Many other usability improvements
Quite big fonts
Online installer and history of changes
You can use online flasher where you only need press 'update button'
Download online flasher from github
Download last bin file from github
Future features:
-Regulated source of energy mode - it's not just powerbank, it can use any voltage/wattage/TC in the end or connect some devices
-Puff detection - in this mode you do not need press fire button, all you need is start to puff
-Flashlight mode
-Remember last time when battery changes
-Tune key combos
-Reset atomizer resistance (useful for TC)
-???
Controls:
Now it looks like
2xFire - Temp/Power mode in TC and VVlite (vaaryvolt - yeah, we have it) in WV
3xFire - Profiles
4xFire - Edit screen
-Fire - menu
-Fire - long press - rotate screen
-Fire - looonger - swap +- buttons (in next releases)
+Fire - stealth
+- - key lock
+-Fire (three buttons) - call brightness control
+-Fire long - call flashlight
In menu:
-Fire - go to parent menu
+- - exit from menu
It's FW with pretty informative design
GitHub - ProstoChel/BetterJoy: Better firmware for Joyetech devices: Wismec, Eleaf
Some features:
Regulated AutoFire
VaryVolt
Battery overtemp on charge protection - charge stops if board temp more than 50C (by default) //temporary disabled
Only 4 level for brightness
Everything can be tuned on the mod, no PC needed.
Games (flappy,tetris)
Realtime battery percentage - it shows battery drops
.X ohm format for less than 1 ohm resistance
realtime resistance and base(profile) resistance shows on main screen
Many other usability improvements
Quite big fonts
Online installer and history of changes
You can use online flasher where you only need press 'update button'
Download online flasher from github
Download last bin file from github
Future features:
-Regulated source of energy mode - it's not just powerbank, it can use any voltage/wattage/TC in the end or connect some devices
-Puff detection - in this mode you do not need press fire button, all you need is start to puff
-Flashlight mode
-Remember last time when battery changes
-Tune key combos
-Reset atomizer resistance (useful for TC)
-???
Controls:
Now it looks like
2xFire - Temp/Power mode in TC and VVlite (vaaryvolt - yeah, we have it) in WV
3xFire - Profiles
4xFire - Edit screen
-Fire - menu
-Fire - long press - rotate screen
-Fire - looonger - swap +- buttons (in next releases)
+Fire - stealth
+- - key lock
+-Fire (three buttons) - call brightness control
+-Fire long - call flashlight
In menu:
-Fire - go to parent menu
+- - exit from menu